ĐÁNH GIÁ MỐI LIÊN QUAN GIỮA DIỆN TÍCH BỀ MẶT SỎI THẬN VÀ MỨC ĐỘ GIÃN ĐÀI BỂ THẬN TRÊN CẮT LỚP VI TÍNH ĐA DÃY VỚI THỜI GIAN TÁN SỎI QUA DA

Abstract

Purposes: The aim of this study was to evaluate the relationship between kidney stone surface area on multi-slices computed tomography and percutaneous nephrolithotomy (PCNL) time. Material and methods: Descriptive study at Hanoi Medical University Hospital from July 2022 to July 2023 on 71 patients with kidney stones undergoing PCNL and multi-slices CT scans before PCNL and checked the stone cleanliness after PCNL. The stone surface area was calculated for each patient according to the formula S=π/4 x length x width of stone and classified into levels  <400 mm², from 400-799 mm², from 800 -1599 mm² and >1600 mm² and then compared with PCNL time to determine the relationship between these two factors. Results: Mean age was 53.8±12.3. Male/female ratio was 1.54. The proportion of stones with surface area <400 mm² (=21), from 400-799 mm² (n=30), from 800 -1599 mm² (n=14) and >1600 mm² (n=6) were 29.6%, 42.3% 19.7% and 8.5% respectively and corresponded to PCNL time (in minutes) of 50.8±12.6, 62.7±25.0, 83.3±42.4 and 112.5±41.4. There was a statistically significant difference (p=0.003) of PCNL time between the different stone surface area groups. The proportion of patients with nondilated (n=2), mildly dilated (n=43), moderately dilated (n=21) and severely dilated (n=5) renal pelvises was 2.8%; 60.6%; 29.6% and 7%, respectively. The PCN lithotripsy time (in minutes) of the non-dilated or slightly dilated renal pelvis group and the moderately dilated or severely dilated group were 59.6±26.7 and 81.8±38.4, respectively. There was a statistically significant difference (p=0.006) in PCNL time between these two groups. Conclusion: Kidney stone surface area and the degree of renal pelvic dilatation was associated with PCNL time with p < 0.05. Evaluation of these two parameters played an important role for the prediction of PCNL success